3D printing model and printing method of inverted L-shaped structure surface

Abstract

The present application relates to a kind of 3D printing model of inverted L-shaped structure surface and printing method, belong to 3D printing technical field, solve the problem that existing inverted L-shaped structure surface model cannot be realized integrated printing forming.The 3D printing model includes horizontal surface, vertical surface and support structure between horizontal surface and vertical surface, the vertical surface is used to form the vertical surface of inverted L-shaped structure surface;The support structure is used to provide the support surface of the horizontal surface formation of inverted L-shaped structure surface;The horizontal surface is used to form the horizontal surface of inverted L-shaped structure surface on the support surface.This 3D printing model can be used to integrated printing self-forming inverted L-shaped structure surface.

Description

Technical Field

[0001] The present invention relates to the field of 3D printing technology, and in particular to a 3D printing model and a printing method for an inverted L-shaped structural surface. Background Art

[0002] With the continuous development of 3D printing technology, more and more parts are being produced or trial-produced using 3D printing. During the part design process, some mounting and alignment structures inevitably require flat or large curved surfaces. During the additive manufacturing printing process, the inverted L-shaped structure, with its horizontal and vertical forming angle greater than 45° (i.e., the angle with the horizontal plane is less than 45°), can lead to poor printing quality or even failure to form. Summary of the Invention

[0003] In view of the above analysis, an embodiment of the present invention aims to provide a 3D printing model and printing method of an inverted L-shaped structural surface, so as to solve the problem that the existing 3D printing model of an inverted L-shaped structural surface cannot be printed in one piece.

[0004] In one aspect, the present invention provides a 3D printing model of an inverted L-shaped structural surface, wherein the 3D printing model includes a horizontal surface, a vertical surface, and a support structure disposed between the horizontal surface and the vertical surface;

[0005] The vertical surface is used to form the vertical surface of the inverted L-shaped structural surface;

[0006] The support structure is used to provide a support surface for forming the transverse surface of the inverted L-shaped structural surface;

[0007] The transverse surface is used to form a transverse surface of an inverted L-shaped structural surface on the supporting surface.

[0008] Preferably, the area of ​​the support surface of the support structure decreases step by step along the extension direction of the free end of the vertical surface below the horizontal surface.

[0009] Preferably, the upper end surface of the support structure coincides with the horizontal surface, and the lower end surface of the support structure is connected to the vertical surface.

[0010] Preferably, the support structure includes a plurality of prism support blocks and a support frame arranged below the prism support blocks;

[0011] The upper end surface of the prism support block is larger than the lower end surface, the upper end surface of the prism support block coincides with the horizontal surface, the lower end surface of the prism support block coincides with the upper end surface of the support frame, and the lower end surface of the support frame is connected to the vertical surface.

[0012] Preferably, the support frame includes a primary support frame and a secondary support frame arranged in sequence from top to bottom.

[0013] Preferably, an intermediate support frame is provided between the primary support frame and the secondary support frame.

[0014] Preferably, the primary support frame comprises four columns, the upper end surfaces of the four columns are respectively connected to the lower end surfaces of four adjacent prism support blocks, and the lower end surfaces of the four columns are connected to each other to form the lower end surface of the primary support frame;

[0015] The upper end surface of the secondary support frame is connected to the lower end surface of the primary support frame, and the lower end surface of the secondary support frame is connected to the vertical surface.

[0016] Preferably, the lower end surfaces of the plurality of prism support blocks are located on the same plane.

[0017] Preferably, the angle between the side surface of the pyramid support block and the horizontal plane is greater than or equal to 45°.

[0018] In another aspect, the present invention provides a 3D printing method for an inverted L-shaped structural surface, using the above-mentioned 3D printing model, the method comprising:

[0019] (a) Print the vertical side;

[0020] (b) printing a secondary support frame from one side of the vertical surface;

[0021] (c) printing an intermediate support frame from the upper end surface of the secondary support frame;

[0022] (d) printing a primary support frame from the upper end surface of the intermediate support frame;

[0023] (e) printing a pyramid support block from the upper end surface of the primary support frame;

[0024] (f) Printing a transverse surface on the upper end surface of the prism support block.

[0025] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0026] 1. The 3D printing model of the inverted L-shaped structural surface of the present invention can realize the self-printing forming of the inverted L-shaped structural surface.

[0027] 2. The present invention provides a support structure between the horizontal and vertical surfaces of the inverted L-shaped structural surface. The support surface of the support structure decreases step by step from the horizontal surface to the vertical surface, thereby avoiding the problem of greatly increasing the weight of the parts and occupying a large amount of the internal volume of the parts. The support structure does not need to be removed.

[0028] 3. In one embodiment, the present invention utilizes a pyramid support block to convert the cross-sectional area of ​​the pyramid support block from the large end face (upper end face) to the small end face (lower end face) of the pyramid support block. Simultaneously, the two ends of the support frame are connected to the small end face and vertical face of the pyramid support block, achieving support and further reducing the support surface area. This support structure weighs less than 20% of existing solid support structures and occupies less than 20% of the internal volume of existing solid support structures, avoiding the problems of significantly increasing the weight and internal volume of the component, and the support structure does not need to be removed.

[0029] 4. The lower end surfaces of the multiple prism support blocks of the present invention are located on the same horizontal plane, which can convert the cross sections of various irregularly shaped surfaces into planes. Therefore, the 3D printing model of the present invention is applicable to any irregularly shaped cross sections.

[0030] 5. The 3D printing method of the present invention can realize the self-forming of the transverse surface of the inverted L-shaped structure, solving the problem that the transverse surface of the inverted L-shaped structure is difficult to form during the printing process, and realizes the self-forming of the transverse surface of the inverted L-shaped structure by adding less material weight.

[0031] In the present invention, the above-mentioned technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of the present invention will be described in the following description, and some advantages will become apparent from the description or be learned through practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the contents particularly pointed out in the description and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like parts throughout the drawings.

[0033] Figure 1 A schematic cross-sectional perspective view of a 3D printed model of an inverted L-shaped structural surface provided by one embodiment of the present invention;

[0034] Figure 2 A front view of a horizontal plane of a 3D printed model of an inverted L-shaped structural surface provided by one embodiment of the present invention;

[0035] Figure 3 A side view of a 3D printed model of an inverted L-shaped structural surface provided by one embodiment of the present invention;

[0036] Figure 4 This is a schematic diagram of the structure of the pyramid support block of the present invention;

[0037] Figure 5A schematic cross-sectional perspective view of a 3D printed model of an inverted L-shaped structural surface provided in another embodiment of the present invention.

[0038] Reference numerals:

[0039] 1- horizontal surface; 2- prism support block; 3- primary support frame; 4- secondary support frame; 5- vertical surface; 6- intermediate support frame. DETAILED DESCRIPTION

[0040] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, and are not used to limit the scope of the present invention.

[0041] On the one hand, the present invention provides a horizontal surface of a 3D printed model of an inverted L-shaped structural surface, wherein the 3D printed model includes a horizontal surface 1, a vertical surface 5, and a support structure arranged between the horizontal surface 1 and the vertical surface 5;

[0042] The vertical surface 5 is used to form the vertical surface of the inverted L-shaped structural surface;

[0043] The support structure is used to provide a support surface for forming the transverse surface of the inverted L-shaped structural surface;

[0044] The transverse surface 1 is used to form a transverse surface of an inverted L-shaped structural surface on the supporting surface.

[0045] The 3D printing model of the inverted L-shaped structural surface of the present invention can realize self-printing forming of the inverted L-shaped structural surface.

[0046] In one embodiment, the support surface of the support structure decreases step by step below the transverse surface 1 along the extension direction of the free end of the vertical surface 5 .

[0047] In one embodiment, the upper end surface of the support structure coincides with the transverse surface 1 , and the lower end surface of the support structure is connected to the vertical surface 5 .

[0048] It should be noted that the vertical surface 5 is located on a side below the horizontal surface 1 and is arranged at an angle to the horizontal surface 1 .

[0049] Specifically, if Figure 1-3 As shown, the support structure includes a plurality of prism support blocks 2 and a support frame arranged under the prism support blocks 2;

[0050] The upper end surface of the prism support block 2 is larger than the lower end surface, the upper end surface of the prism support block 2 coincides with the horizontal surface 1, the lower end surface of the prism support block 2 coincides with the upper end surface of the support frame, and the lower end surface of the support frame is connected to the vertical surface 5.

[0051] The support structure of the present invention converts the cross-sectional area of ​​the pyramid support block 2 from the large end face (upper end face) to the small end face (lower end face) of the pyramid support block 2 through the pyramid support block 2. Simultaneously, the two ends of the support frame are connected to the small end face and vertical surface 5 of the pyramid support block 2, respectively, achieving the desired support effect while further reducing the support surface area. This support structure weighs less than 20% of existing solid support structures and occupies less than 20% of the internal volume of existing solid support structures, avoiding the problems of significantly increasing the weight and internal volume of the component, and the support structure does not need to be removed.

[0052] It should be noted that, unless otherwise specified, the "upper" and "lower" in the present invention refer to the "upper" and "lower" in the main view of the part.

[0053] In the present invention, transverse surface 1 is a surface requiring support or a portion thereof. The angle between transverse surface 1 and the horizontal plane is less than 45°, which does not meet the self-forming conditions for 3D printed parts without support or results in poor surface quality after forming. The structural shapes of transverse surface 1 include, but are not limited to, planes, curved surfaces, and boss structures. Its main characteristic is that it cannot self-form during the forming process. The wall thickness of transverse surface 1 can be any value greater than 0.5 mm, and the upper and lower surfaces of transverse surface 1 may include local features such as bosses, through-holes, and reinforcing ribs.

[0054] In one embodiment, the angle between the vertical surface 5 and the horizontal plane is greater than or equal to 45°, the vertical surface 5 can be directly printed and formed, and can be used to connect with the structure of the secondary support frame 4, to play a supporting role for the secondary support frame 4 and the structure above it. Similarly, the structural form of the vertical surface 5 is not limited to a plane, and can also be various forms of curved surfaces and special-shaped surfaces, as long as the above-mentioned self-forming conditions are met.

[0055] In one embodiment, the support frame includes a primary support frame 3 and a secondary support frame 4 arranged in sequence from top to bottom; the support structure includes multiple primary support frames 3 and multiple secondary support frames 4.

[0056] The first-level support frame 3 includes four columns, the upper end faces of the four columns are respectively connected to the lower end faces of four adjacent prism support blocks 2, and the lower end faces of the four columns are connected to each other to form the lower end face of the first-level support frame 3; the "adjacent" refers to four prism support blocks 2 that can be surrounded by a square.

[0057] The upper end surface of the secondary support frame 4 is connected to the lower end surface of the primary support frame 3 , and the lower end surface of the secondary support frame 4 is connected to the vertical surface 5 .

[0058] It is understood that four columns extend downward from the lower end surfaces of four adjacent pyramid support blocks 2, and the lower end surfaces of the four columns are interconnected to form a primary support frame 3. The function of the primary support frame 3 is to convert the four lower end support surfaces of the four pyramid support blocks 2 into a single support surface at the upper end of the primary support frame 3, further reducing the area of ​​the required support plane and the volume of the support frame structure; the primary support frame 3 is also used to support the printing of the pyramid support blocks 2.

[0059] In one embodiment, the lower end surface of the primary support frame 3 is a horizontal surface.

[0060] In one embodiment, the upper end surface of the primary support frame 3 and the lower end surface of the prism support block 2 are consistent in shape and completely overlap.

[0061] In the present invention, the lower end surface of the primary support frame 3 is used to connect to the upper end surface of the secondary support frame 4. The cross-sectional shape and area of ​​the lower end surface of the primary support frame 3 can be adjusted according to the required strength of the support structure. The cross-sectional shape and area of ​​the lower end surface of the primary support frame 3 can be different from those of the upper end surface of the primary support frame 3.

[0062] Exemplarily, the cross-sectional shape of the lower end surface of the primary support frame 3 is circular, elliptical, rectangular, etc., and the cross-sectional area is larger or smaller than that of the upper end surface.

[0063] It is understandable that the lower end surface of the primary support frame 3 extends toward the vertical surface 5 to form a secondary support frame 4. The secondary support frame 4 is used to support the printing of the primary support frame 3.

[0064] In one embodiment, the upper end surface of the secondary support frame 4 is consistent in shape with the lower end surface of the primary support frame 3 and completely overlaps with each other.

[0065] In the present invention, the cross-sectional shape and area of ​​the lower end surface of the secondary support frame 4 can be adjusted according to the strength requirements of the support structure.

[0066] Exemplarily, the cross-sectional shape of the lower end surface of the secondary support frame 4 is circular, elliptical, rectangular, etc., and the cross-sectional area is larger or smaller than that of the upper end surface.

[0067] In order to ensure the self-forming printing of the primary support frame 3 and the secondary support frame 4, the angle between each column of the primary support frame 3 and the horizontal plane is greater than or equal to 45°, and the angle between the secondary support frame 4 and the horizontal plane is greater than or equal to 45°.

[0068] It should be noted that when the required support area is large, an intermediate support frame 6 with a structure similar to the primary support frame 3 can be set between the primary support frame 3 and the secondary support frame 4 to further reduce the support area.

[0069] For example, Figure 2 and 3 As shown, four intermediate struts extend downward from the lower end surfaces of four adjacent primary support frames 3. The upper end surfaces of the four intermediate struts overlap and connect with the lower end surfaces of the four adjacent primary support frames 3, and the lower end surfaces of the four intermediate struts are connected to each other, thereby reducing the area of ​​the four lower end surfaces of the four primary support frames 3 to the lower end surface of one intermediate support frame 6. The lower end surface of the intermediate support frame 6 is connected to the upper end surface of the secondary support frame 4. Each strut of the intermediate support frame 6 forms an angle greater than or equal to 45° with the horizontal plane.

[0070] In the present invention, there can be multiple intermediate support frames 6, which are arranged in the same manner as described above, so as to gradually reduce the overall support area.

[0071] When the required support strength of the parts is high, the structure of the secondary support frame 4 can be transformed from one end face connected to the vertical face 5 to the entire side of the secondary support frame 4 connected to the vertical face 5, that is, the secondary support frame 4 is a right-angled triangular plate perpendicular to both the horizontal face 1 and the vertical face 5, and the two right-angled sides are parallel to the horizontal face 1 and the vertical face 5 perpendicular to each other, one of the right-angled sides is used to connect to the primary support frame 3, and the other right-angled side is connected to the vertical face 5, such as Figure 5 As shown, the connection strength between the secondary support frame 4 and the vertical surface 5 can be increased to prevent deformation and cracking of the connection position due to excessive stress.

[0072] In the present invention, the function of the pyramid support block 2 is to convert the area of ​​the transverse surface 1 from the area of ​​the upper end surface of the pyramid support block 2 to the area of ​​the lower end surface, that is, from a large area to a small area, thereby reducing the area to be supported.

[0073] It should be noted that the pyramid support block 2 is a solid structure.

[0074] In one embodiment, Figure 1-4 As shown, each of the pyramid support blocks 2 is a quadrangular prism.

[0075] It can be understood that the upper end surfaces of the multiple prism support blocks 2 constitute the transverse surface 1, that is, the transverse surface 1 is divided into multiple squares, which are the upper end surfaces of the prism support blocks 2, and a prism support block 2 extends downward from each square.

[0076] In one embodiment, the lower end surfaces of the plurality of pyramid support blocks 2 are located on the same plane. The pyramid support block 2 can convert the transverse surfaces 1 of various irregularly shaped surfaces into a plane formed by the lower end surfaces of the pyramid support block 2 to improve the stability of the support.

[0077] Furthermore, the lower end surface of the prism support block 2 is a horizontal surface.

[0078] In order to ensure the self-forming printing of the pyramid support block 2, the angle between the side surface of the pyramid support block 2 and the horizontal plane is greater than or equal to 45°.

[0079] In the present invention, the area of ​​the upper end surface of the prism support block 2 determines the area of ​​the transverse surface that each prism support block 2 can support, and the area of ​​the lower end surface of the prism support block 2 determines the area of ​​the end surface of the support frame connected thereto, thereby determining the structural strength of the support frame. Therefore, the area of ​​the upper and lower end surfaces of the prism support block 2 can be adjusted according to the stress level of the supporting structure.

[0080] In one embodiment, the upper end face and the lower end face of the pyramid support block 2 are square, the side length of the upper end face is 4-8 mm, and the side length of the lower end face is 0.5-2 mm.

[0081] In the present invention, the vertical surface 5 can be a part of the component body, such as Figure 1 As shown, the vertical surface 5 is located below the transverse surface 1 , and one side is connected to one side of the transverse surface 1 .

[0082] On the other hand, the present invention also provides a 3D printing method for an inverted L-shaped structural surface, using the above-mentioned 3D printing model, the method comprising:

[0083] (a) Print vertical side 5;

[0084] (b) printing a secondary support frame 4 from one side of the vertical surface 5;

[0085] (c) printing the intermediate support frame 6 from the upper end surface of the secondary support frame 4;

[0086] (d) printing the primary support frame 3 from the upper end surface of the intermediate support frame 6;

[0087] (e) printing the prism support block 2 from the upper end surface of the primary support frame 3;

[0088] (f) Printing the transverse surface 1 on the upper end surface of the prism support block 2.

[0089] Specifically, during the 3D printing process, the vertical surface 5 is printed and formed first, and then the secondary support frame 4 is gradually printed and formed from one side of the vertical surface 5. The intermediate support frame 6 is gradually printed and formed through the upper end surface support of the secondary support frame 4. The primary support frame 3 is gradually printed and formed through the upper end surface support of the intermediate support frame 6. The upper end surface of each column of the primary support frame 4 supports the prism support block 2 to be printed and formed. Finally, the transverse surface 1 is printed and formed on the upper end surface of the prism support block 2 to complete the 3D printing of the transverse surface 1.

[0090] The 3D printing method of the present invention can realize the self-forming of the inverted L-shaped structural surface by printing, solving the problem that the inverted L-shaped structural surface is difficult to form during the printing process. The self-forming of the inverted L-shaped structural surface by printing is realized by adding less material weight, eliminating the need to remove the support structure.

[0091] The following is a further explanation of the 3D printing model and printing method of the inverted L-shaped structural surface of the present invention through specific examples.

[0092] Example 1-1

[0093] A 3D printing model of an inverted L-shaped structural surface is provided, such as Figure 1 As shown:

[0094] The 3D printing model includes an inverted L-shaped structural surface and a support structure arranged between the horizontal surface 1 and the vertical surface 5 of the inverted L-shaped structural surface;

[0095] The support structure includes a plurality of prism support blocks 2 arranged below the transverse surface 1 and a support frame arranged below the prism support block 2; the upper end surface of the prism support block 2 is larger than the lower end surface, the upper end surface of the prism support block 2 coincides with the transverse surface 1, the lower end surface of the prism support block 2 coincides with the upper end surface of the support frame, and the lower end surface of the support frame is connected to the vertical surface 5; the vertical surface 5 is located on one side below the transverse surface 1 and is arranged at an angle to the transverse surface 1.

[0096] The prism support block 2 is a solid structure. Each of the prism support blocks 2 is a quadrangular prism. The upper end faces of the multiple prism support blocks 2 constitute the overhanging surface 1, that is, the transverse surface 1 is divided into multiple squares, and the square is the upper end face of the prism support block 2, and a prism support block 2 extends downward from each square. The lower end faces of the multiple prism support blocks 2 are located on the same plane. The lower end face of the prism support block 2 is a horizontal plane. The angle between the side face of the prism support block 2 and the horizontal plane is equal to 45°, and the upper and lower end faces of the prism support block 2 are squares, the side length of the upper end face is 5 mm, and the side length of the lower end face is 1 mm.

[0097] The support frame includes a primary support frame 3 and a secondary support frame 4, arranged sequentially from top to bottom. The support structure includes multiple primary support frames 3 and multiple secondary support frames 4. The primary support frame 3 includes four columns, the upper end surfaces of which are respectively connected to the lower end surfaces of four adjacent pyramid support blocks 2. The lower end surfaces of the four columns are interconnected to form the lower end surface of the primary support frame 3. The upper end surface of the secondary support frame 4 is connected to the lower end surface of the primary support frame 3, and the lower end surface of the secondary support frame 4 is connected to the vertical surface 5. The lower end surface of the primary support frame 3 is horizontal. The upper end surface of the primary support frame 3 is consistent in shape with the lower end surface of the pyramid support block 2 and completely overlaps. The upper end surface of the secondary support frame 4 is consistent in shape with the lower end surface of the primary support frame 3 and completely overlaps. Each column of the primary support frame 3 forms a 45° angle with the horizontal plane, and each secondary support frame 4 forms a 45° angle with the horizontal plane.

[0098] Example 1-2

[0099] A 3D printing model of an inverted L-shaped structural surface is provided, such as Figure 2 As shown:

[0100] The 3D printing model includes an inverted L-shaped structural surface and a support structure arranged between the horizontal surface 1 and the vertical surface 5 of the inverted L-shaped structural surface;

[0101] The support structure includes a plurality of prism support blocks 2 arranged below the transverse surface 1 and a support frame arranged below the prism support block 2; the upper end surface of the prism support block 2 is larger than the lower end surface, the upper end surface of the prism support block 2 coincides with the transverse surface 1, the lower end surface of the prism support block 2 coincides with the upper end surface of the support frame, and the lower end surface of the support frame is connected to the vertical surface 5; the vertical surface 5 is located on one side below the transverse surface 1 and is arranged at an angle to the transverse surface 1.

[0102] The prism support block 2 is a solid structure. Each of the prism support blocks 2 is a quadrangular prism. The upper end faces of the multiple prism support blocks 2 constitute the transverse surface 1, that is, the transverse surface 1 is divided into multiple squares, and the square is the upper end face of the prism support block 2, and a prism support block 2 extends downward from each square. The lower end faces of the multiple prism support blocks 2 are located on the same plane. The lower end face of the prism support block 2 is a horizontal plane. The angle between the side face of the prism support block 2 and the horizontal plane is equal to 45°, and the upper and lower end faces of the prism support block 2 are squares, the side length of the upper end face is 5 mm, and the side length of the lower end face is 1 mm.

[0103] The support frame includes a primary support frame 3 and a secondary support frame 4, arranged sequentially from top to bottom. The support structure includes multiple primary support frames 3 and multiple secondary support frames 4. The primary support frame 3 includes four columns, the upper end surfaces of which are respectively connected to the lower end surfaces of four adjacent pyramid support blocks 2. The lower end surfaces of the four columns are interconnected to form the lower end surface of the primary support frame 3. The upper end surface of the secondary support frame 4 is connected to the lower end surface of the primary support frame 3, and the lower end surface of the secondary support frame 4 is connected to the vertical surface 5. The lower end surface of the primary support frame 3 is horizontal. The upper end surface of the primary support frame 3 is consistent in shape with the lower end surface of the pyramid support block 2 and completely overlaps. The upper end surface of the secondary support frame 4 is consistent in shape with the lower end surface of the primary support frame 3 and completely overlaps. Each column of the primary support frame 3 forms a 45° angle with the horizontal plane, and each secondary support frame 4 forms a 45° angle with the horizontal plane.

[0104] An intermediate support frame 6 having a structure similar to that of the primary support frame 3 is provided between the primary support frame 3 and the secondary support frame 4 .

[0105] Examples 1-3

[0106] A 3D printing model of an inverted L-shaped structural surface is provided, such as Figure 5 As shown:

[0107] The 3D printing model includes an inverted L-shaped structural surface and a support structure arranged between the horizontal surface 1 and the vertical surface 5 of the inverted L-shaped structural surface;

[0108] The support structure includes a plurality of prism support blocks 2 arranged below the transverse surface 1 and a support frame arranged below the prism support block 2; the upper end surface of the prism support block 2 is larger than the lower end surface, the upper end surface of the prism support block 2 coincides with the transverse surface 1, the lower end surface of the prism support block 2 coincides with the upper end surface of the support frame, and the lower end surface of the support frame is connected to the vertical surface 5; the vertical surface 5 is located on one side below the transverse surface 1 and is arranged at an angle to the transverse surface 1.

[0109] The prism support block 2 is a solid structure. Each of the prism support blocks 2 is a quadrangular prism. The upper end faces of the multiple prism support blocks 2 constitute the transverse surface 1, that is, the transverse surface 1 is divided into multiple squares, and the square is the upper end face of the prism support block 2, and a prism support block 2 extends downward from each square. The lower end faces of the multiple prism support blocks 2 are located on the same plane. The lower end face of the prism support block 2 is a horizontal plane. The angle between the side face of the prism support block 2 and the horizontal plane is equal to 45°, and the upper and lower end faces of the prism support block 2 are squares, the side length of the upper end face is 5 mm, and the side length of the lower end face is 1 mm.

[0110] The support frame includes a primary support frame 3 and a secondary support frame 4, arranged sequentially from top to bottom. The support structure includes multiple primary support frames 3 and multiple secondary support frames 4. The primary support frame 3 includes four columns, the upper end surfaces of which are respectively connected to the lower end surfaces of four adjacent pyramid support blocks 2. The lower end surfaces of the four columns are interconnected to form the lower end surface of the primary support frame 3. The upper end surface of the secondary support frame 4 is connected to the lower end surface of the primary support frame 3, and the lower end surface of the secondary support frame 4 is connected to the vertical surface 5. The lower end surface of the primary support frame 3 is horizontal. The upper end surface of the primary support frame 3 is consistent in shape with the lower end surface of the pyramid support block 2 and completely overlaps. The upper end surface of the secondary support frame 4 is consistent in shape with the lower end surface of the primary support frame 3 and completely overlaps. Each column of the primary support frame 3 forms a 45° angle with the horizontal plane, and each secondary support frame 4 forms a 45° angle with the horizontal plane.

[0111] An intermediate support frame 6 having a structure similar to that of the primary support frame 3 is provided between the primary support frame 3 and the secondary support frame 4 .

[0112] The entire side surface of the secondary support frame 4 is connected to the vertical surface 5, that is, the secondary support frame 4 is a right-angled triangular plate that is perpendicular to both the horizontal surface 1 and the vertical surface 5, and the two right-angled sides are parallel to the horizontal surface 1 and the vertical surface 5 that are perpendicular to each other, one of the right-angled sides is used to connect to the primary support frame 3, and the other right-angled side is connected to the vertical surface 5.

[0113] Example 2-1

[0114] This embodiment provides a 3D printing method for an inverted L-shaped structural surface, comprising the following steps:

[0115] (a) Print vertical surface 5, where the angle between vertical surface 5 and the horizontal plane is 90°.

[0116] (b) Printing a secondary support frame 4 from one side of the vertical surface 5, with the angle between the secondary support frame 4 and the horizontal plane being 45°.

[0117] (c) Printing the intermediate support frame 6 from the upper end surface of the secondary support frame 4, the angle between the intermediate support frame 6 and the horizontal plane is 45 degrees, and the upper end surface of the secondary support frame 4 and the lower end surface of the intermediate support frame 6 are consistent in shape and completely overlap;

[0118] (d) Printing the first-level support frame 3 from the upper end surface of the intermediate-level support frame 6; the upper end surface of the intermediate-level support frame 6 is consistent in shape with the lower end surface of the first-level support frame 3 and completely overlaps; the angle between the first-level support frame 3 and the horizontal plane is 45°.

[0119] (e) Print a pyramid support block 2 from the upper end face of each column of the first-level support frame 3; the upper end face of each column of the first-level support frame 3 is consistent in shape with the lower end face of the pyramid support block 2 and completely overlaps; the upper end face and the lower end face of the pyramid support block 2 are square, the side length of the upper end face is 5 mm, and the side length of the lower end face is 1 mm; the angle between the side face of the pyramid support block 2 and the horizontal plane is 45°.

[0120] (f) A transverse surface 1 is printed on the upper end surface of the prism support block 2. The wall thickness of the transverse surface 1 is 0.6 mm, and the angle between the transverse surface 1 and the horizontal plane is 0°.

[0121] The support structure weighs only 18% of a solid support and occupies 18% of the internal volume of the part. The solid support refers to a completely solid triangular support formed between the horizontal and vertical surfaces that can be formed by 3D printing.

[0122] Example 2-2

[0123] This embodiment provides a 3D printing method for an inverted L-shaped structural surface, comprising the following steps:

[0124] (a) Print vertical surface 5, where the angle between vertical surface 5 and the horizontal plane is 85°.

[0125] (b) Printing a secondary support frame 4 from one side of the vertical surface 5 , the angle between the secondary support frame 4 and the horizontal plane is 50°, and the entire side surface of the secondary support frame 4 is connected to the vertical surface 5 .

[0126] (c) Print the intermediate support frame 6 from the upper end face of the secondary support frame 4. The upper end face of the secondary support frame 4 and the lower end face of the intermediate support frame 6 have the same shape and completely overlap. Each support column of the intermediate support frame 6 has an angle of 50° with the horizontal plane.

[0127] (d) Print the first-level support frame 3 from the upper end face of each pillar of the intermediate-level support frame 6; the upper end face of each pillar of the intermediate-level support frame 6 is consistent in shape with the lower end face of the first-level support frame 3 and completely overlaps; the angle between each pillar of the first-level support frame 3 and the horizontal plane is 50°.

[0128] (e) Print a pyramid support block 2 from the upper end face of each column of the first-level support frame 3; the upper end face of each column of the first-level support frame 3 is consistent in shape with the lower end face of the pyramid support block 2 and completely overlaps; the upper end face and the lower end face of the pyramid support block 2 are square, the side length of the upper end face is 5 mm, and the side length of the lower end face is 1 mm; the angle between the side face of the pyramid support block 2 and the horizontal plane is 50°.

[0129] (f) A transverse surface 1 is printed on the upper end surface of the prism support block 2. The wall thickness of the transverse surface 1 is 0.6 mm, and the angle between the transverse surface 1 and the horizontal plane is 5°.

[0130] The support structure weighs only 19.2% of a solid support and occupies 19.2% of the internal volume of the part. The solid support refers to a completely solid triangular support formed between the horizontal and vertical surfaces that can be formed by 3D printing.

[0131] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed by the present invention should be covered by the scope of protection of the present invention.

Claims

1. A 3D printing model of an inverted L-shaped structural surface, characterized in that: The 3D printing model comprises a horizontal surface (1), a vertical surface (5), and a support structure arranged between the horizontal surface (1) and the vertical surface (5); The vertical surface (5) is used to form the vertical surface of the inverted L-shaped structural surface; The support structure is used to provide a support surface for forming the transverse surface of the inverted L-shaped structural surface; The transverse surface (1) is used to form a transverse surface of an inverted L-shaped structural surface on the support surface; The structural shapes of the cross section include plane, curved surface, and boss structure; The support surface of the support structure decreases in area step by step along the extension direction of the free end of the vertical surface (5) below the horizontal surface (1); The support structure comprises a plurality of prism support blocks (2) and a support frame arranged below the prism support blocks (2); The upper end surface of the prism support block (2) is larger than the lower end surface, the upper end surface of the prism support block (2) coincides with the transverse surface (1), the lower end surface of the prism support block (2) coincides with the upper end surface of the support frame, and the lower end surface of the support frame is connected to the vertical surface (5); The lower end surfaces of the plurality of prism support blocks (2) are located on the same plane; the angle between the side surface of the prism support block (2) and the horizontal plane is greater than or equal to 45°; The pyramid support block converts the area of ​​the cross-section from the area of ​​the upper end surface of the pyramid support block to the area of ​​the lower end surface, that is, converts a large area into a small area, thereby reducing the area required for support; the pyramid support block converts the cross-section of the special-shaped surface into a plane formed by the lower end surface of the pyramid support block; The support frame comprises a primary support frame (3) and a secondary support frame (4) arranged in sequence from top to bottom; The primary support frame (3) comprises four columns, the upper end surfaces of the four columns are respectively connected to the lower end surfaces of four adjacent prism support blocks (2), and the lower end surfaces of the four columns are connected to each other to form the lower end surface of the primary support frame (3); The upper end surface of the secondary support frame (4) is connected to the lower end surface of the primary support frame (3), and the lower end surface of the secondary support frame (4) is connected to the vertical surface (5); The weight of the support structure is within 20% of the weight of the existing solid support structure, and the internal volume of the part occupied is only within 20% of the existing solid support structure. The support structure does not need to be removed.

2. The 3D printing model according to claim 1, characterized in that The upper end surface of the support structure coincides with the horizontal surface (1), and the lower end surface of the support structure is connected to the vertical surface (5).

3. The 3D printing model according to claim 1, characterized in that An intermediate support frame (6) is also provided between the primary support frame (3) and the secondary support frame (4).

4. A 3D printing method for an inverted L-shaped structural surface, characterized in that: Using the 3D printing model according to any one of claims 1 to 3, the method comprises: (a) Printing the vertical surface (5); (b) printing a secondary support frame (4) from one side of the vertical surface (5); (c) printing an intermediate support frame (6) from the upper end surface of the secondary support frame (4); (d) printing the primary support frame (3) from the upper end surface of the intermediate support frame (6); (e) printing a pyramid support block (2) from the upper end surface of the primary support frame (3); (f) Printing a transverse surface (1) on the upper end surface of the prism support block (2).

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